Steam-boiler.



J. R. BUSHING, DEOD. M. K. OUSHING, ADMINISTBATBIX. I

STEAM BOILER. APPLICATION FILED NOV. 8, 1912.

1,072,813 1 Patented Sept. 9, 1913.

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COLUMBIA PLANOGRAPH 60., WASHINGTON, n. c.

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STEAM BOILER.

APPLICATION FILED NOV; 8, 1912.

Patented Sept. 9, 1913.

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UNITED srnrns .a'rnnr onnron JAMES R. GUSI-IING, DECEASED, LATE 0E COLUMBUS, OHIO, BY MARY K. CUSI-IING, ADMINISTRATB/IX, 0F COLUMBUS, OHIO.

STEAM-BOILER.

Specification of Letters Patent.

Patented Sept. 9, 1913.

To all whom it may concern:

Be it known that J AMES R. CUsHING, deceased, late a citizen of the United States, residing in Columbus, in the county of Franklin and State of Ohio, have invented a new and useful Improvement in Steam- Boilers, of which the following is a specification.

This invention relates to steam boilers and more particularly to locomotive boilers.

One of the principal objects of the invention is to provide a simple and efficient structure of this type in which all side sheets,

back sheets, and throat sheet are eliminated" with the elimination of all stay bolts.

Another object of the invention is to provide a boiler of this type in which the side sheets and back sheet'are substituted by walls of fire-brick connected to the outer casing of the boiler in such a manner that they may be removed when necessary.

One of the principal reasons why oil burning engines have not become more popular is that the sheets burn out on account of the excessive heat and the chemical reaction which takes place. With this type of boiler having the fire-brick walls, oil burning can be adopted without fear of having to re place the sheets at such frequent intervals. 1

Further objects of this invention will appear as the following specific description is read in connection with the accompanying drawing which forms a part of this applica tion and in which Figure 1 is a longitudinal sectional view showing a detail of the boiler. Fig. 2 is a transverse section on the line 22 of Fig. 1 looking in the direction of the arrow. Fig.

3 is a similar section on the line 33 of Fig. 1. Fig. 4c is a similar view on the line 44 of Fig. 1. Fig. 5 is a detail sectional view of the crown and flue sheets and auxiliary sheet.

. Referring more particularly to the drawing, 1 represents the outer shell of the firebox and 1 the fire-box to which is connected the waist 2. Secured to the inner wall of the casing upon opposite sides of the firebox are substantially U-shaped'channel irons 3 to which the usual form of crown sheet 4: is secured. The crown sheet is connected at its forward end to a head plate 5 which closes the rear end of the boiler as shown 7 complete combustion.

and at its forward end the crown sheet is connected to the fire-box tube sheet 6. This tube sheet is carried upon the crown sheet and upon an auxiliary piece 7 which is also connected to the crown sheet. 4: and supported upon an arcuate substantially U- shaped channel iron 8 which is in turn riveted to the waist 2.

Separated from the wall of the fire-box and from the front plate 9 are walls 10 and 11 formed of fire-brick or other similar reciprocatory blocks each of which are connected by bolts 11 to the casing 1 as shown. The front wall 10 is, of course, connected to the side walls 11 and has an opening 12 arranged therein which registers with a stoke hole 13 formed in the front plate. The bridge wall 14 which is substituted for the ordinary back sheet is constructed of fire brick in the manner shown and connects with the walls 11, being secured to the easing by the bolts 11* as shown. Each of the walls 10, 11 and 14: are preferably lined with suitable refractory material such as sheets of asbestos 15 or the like which lie directly against the walls and prevent the heat absorbed thereby from escaping to any great extent.

The wall 1 1 divides the fire-box into separate compartments 15 and 16 while the walls 10 and 11 coact with the casing to form air passages 18, the entrance to which is indicated by openings 18 shown in dotted lines in Fig. 3. These openings are arranged in the front of the casing adjacent the waist and the air passing through the same into the compartments 18 finds the way to the opening 12 and thence into the fire-box 1. This air being highly heated when it enters the fire-box is in proper condition to commingle with the gases arising from the coals upon the grate and thereby produce a more This air absorbing the heat from the walls has a tendency to keep the walls cool and thereby prevents frequent burning out of the bricks and their consequent removal and replacement.

What is claimed as new, is

1. A boiler comprising a casing, a crown sheet secured thereto, a tube sheet connected to the crown sheet, a waist, and an auxiliary sheet extending rearwardly of the tube sheet and connected thereto and to the waist.

2. A boiler comprising a casing, a crown In testimony whereof I afiix my signature shee't securedtherein, a tube sheet connected i 11{)TGSQHGGOf'iWO'WitIIGSSBS. to the crown Sheet, a waist, and an auxiliary MARY O USHiNG, piece riveted to thecrown sheet and t0 the Admim'stmtwiw 0f the estate of James R.

5 tube-hee't and connected to thewaist, swiel' Owning.

auxiliary sheet forming a continuation of Witnesses: the crown sheet at the point of juncture C; C. CUsHING; with the tube sheet. J N UK KOENAR.

Copies ofthis "patelit maybe obtained for five cents each, by ad'tlressing the Commissioner of Tafte lfts,

Washington, 0. 0. 

